| 单词 | germinal spot |
| 释义 | > as lemmasgerminal spot germinal spot n. [after German Keimfleck (1835 in the passage translated in quot. 1836; also 1796 or earlier in the sense ‘hilum of a seed’)] (a) the nucleolus of an ovum (now historical); (b) the blastoderm in a bird's (or other telolecithal) egg (= blastodisc n. at blasto- comb. form ). ΚΠ 1836 M. Barry tr. R. Wagner in Edinb. Med. & Surg. Jrnl. 45 426 I have distinctly observed the origin of the germinal layer out of the germinal spot [Ger. Keimfleck]. 1863 T. H. Huxley Evid. Man's Place Nature ii. 61 A mass of viscid nutritive matter, the ‘yelk’, within which is enclosed..the ‘germinal vesicle’. In this, lastly, lies a more solid rounded body, termed the ‘germinal spot’. 1957 Amer. Biol. Teacher 19 16/2 The opening was made in a circle designated by the position of the germinal spot. 1989 Jrnl. Hist. Biol. 22 225 Oscar..sought to defend his claim that the Keimflecke or germinal spot became the pronucleus of the ripe egg cell. 2010 G. Scott Essent. Ornithol. iv. 77 (in figure) Germinal spot (blastodisc). < as lemmas |
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